Add exception handling to latest version check

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

HISTORY.rst

@@ -41,6 +41,8 @@
 - Rename all instances of the IMAP server from mailbox to 
   server for clarity.
 - Add book link in the about menu.
+- Add unknown exception handling when checking for the latest
+  version.
 
 3.2.8 (2019-10-01)
 ==================

mayan/apps/dependencies/views.py

@@ -28,6 +28,12 @@ class CheckVersionView(SimpleView):
                 'It is not possible to determine the latest version '
                 'available.'
             )
+        except Exception as exception:
+            message = _(
+                'Unexpected error trying to determine the latest version '
+                'available. Make sure your installation has a connection to '
+                'the internet; %s'
+            ) % exception
         else:
             message = _('Your version is up-to-date.')